I tried wap.cingular, wap.cingular.com and wap.mycingular.com, both with name/password blank. No luck.
Any other suggestions?
I also tried this that I found on another website:
For cingular users
APN: wap.cingular
USER:
pWORD: CINGULAR1 (PAY ATTENTION TO LOWER/UPPER CASE)